Effects of Leonardite on Soil Quality and Rice Yield Improvements
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Abstract
Leonardite is a natural humus-rich material thus a high potential to use in agriculture. However, there is very little information available regarding the use of leonardite for lowland rice. To determine the effects of leonardite on soil quality and rice yield, a pot experiment was conducted using Thai jasmine rice cultivar KDML105. Chemical fertilizer and compost were used for comparison. On the average, the application of compost alone or with leonardite increased soil organic matter, N, P, and K levels about twice as compared to the control. The combination of improved leonardite and compost in treatment 8 and 9 (IL + compost (1:1) and IL + compost (3:1), respectively) gave significantly higher number of tillers (30.3 and 32.0 tillers/plant, respectively), number of panicle (19.33 and 18.67 panicle/plant, respectively) and grain yield (50.58 and 50.29 g/plant, respectively) than the control. All the increased parameters did not show significant different from those obtained using chemical fertilizer. The results indicated that the use of leonardite plus compost showed better performance than leonardite or compost alone. It is therefore concluded that the incorporation of leonardite plus compost into the soil could be used as an alternative to chemical fertilizer for obtaining high yield of rice.
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References
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